Can't deny that. However, he does have an answer for that question. After all, he was thinking that him and Ken would likely fuck at some point, even if he wasn't thinking the lead up would be like this. It takes a moment to go through his pockets, but he does pull out a small bottle of lube. Ta da.

He opens his mouth, a I don't care on the tip of his tongue, but stops. Chikusa actually seems to take some consideration instead just going ahead with things. "...Take it out this time." Ken's channels have their time and place, but for this one...

Chikusa thinks not this time.